“…Six of the studies assessed QoL in the context of known group comparisons, for example according to age, sex, employment and marital status, treatment type and disease parameters [37,38,34,39,36,40,41]. Comparisons were also made using reference values from published normative data from the general population or other disease groups [42,40,43,41,37,38] while two studies included matched healthy volunteers [42,44]. QoL was a primary end point for 9 studies and for 8 of these studies data on longterm QoL issues were provided with intervals between treatment and assessment varying from 2 years [38] to more than 12 years [44,40].…”